Spray gun



2 Sheets-Sheet 1 if M475 C. S. DUKE, JR

SPRAY GUN INVENTOR CHARLES S. DUKE,JR

ATTORNEYS Feb. 4, 1964 Filed July 16, 1962 C. S. DUKE, JR

Feb. 4, 1964 SPRAY GUN 2 Sheets-Sheet 2 Filed July 16, 1962 INVENTOR CHARLES S. DUKE,JR.

United States Patent Office 3,120,347 Patented Feb. 4, 1964 3,120,347 SPRAY GUN Charles S. Duke, Jr., 1522 W. Cherry St., Milwaukee, Wis. Filed July 16, 1962, Ser. No. 210,604 6 Claims. (Cl. 239-332) This invention appertains to spray guns and more particularly to electrically operated guns of the type especially designed for spraying paint.

Electrically operated paint spray guns are open to serious objections by the users thereof, in that, the guns soon become clogged with hardened paint. Great difficulty is encountered in the cleaning thereof and in many instances the cleaning thereof has been impossible.

lt is, therefore, one of the primary objects of my invention to provide a spray gun which can be quickly dis- Iassembled to expose all parts thereof, so that such parts can `be easily and rapidly cleaned.

Another salient object of the invention is to provide a gun which can be readily taken apart and one in which certain parts are made in sections so as to render each section easily cleanable.

A further prime object of the invention is to provide an electric vibrator spray gun having its pump so positioned and mounted as to be readily accessible and replaceable whereby different characters of pumps can be used according to the type of paint (thickness etc.) being used.

A still `further important object of my invention is to provide an electric vibrator paint spray `gun which will be durable and efficient in use, one that will be easy to manufacture and service and `one which can be placed upon the market at a reasonable cost.

With these and other objects in View, the invention consists in the novel construction, arangement and formation of parts, as will be hereinafter more specifically described and claimed, and illustrated in the accompanying drawings, in which drawings,

[FIGURE yl is a vertical central sectional view through the complete spray gun taken on the line 1-1 of FIG- URE 3 looking in the direction of the arrows, the view showing the adjusting knob for -the armature in a lowered position to penmit the turning of the limiting screw;

FlGURE 2 is a top plan View of my improved electric vibrating spray gun, and

FIGURE 3 is a horizontal sectional view through the spray gun taken on the line 3--3 of FIGURE 1, looking in the direction of the arrows but showing the nozzle in top plan. d

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several view, the leter G generally indicates .my improved spray gu-n and the same embodies a main base 5 which carries various elements of the gun. The base 5 includes a `disc shaped ywall I6 having formed on its periphery an internally threaded sleeve 7. This sleeve 7 can be of a `diameter substantially equal to the diameter of the threaded neck of a Mason jar. Mounted on the upper lface of the base 5 in any suitable manner is .an electromagnet 8 having an armature 9 pivotal-ly carried thereby. The magnet yS and its armature 9 constitute part of an electric vibrating motor of a type no-w commonly found on the open market. The magnet and other parts are housed within a casing 10.

The casing 10 is formed from companion longitudinal half sections 11 and 12 to facilitate the stamping -or molding thereof. These sections can be formed from any desired material, but sheet metal o-f the desired gauge is preferred.

The housing includes a front circular housing portion and a rear depending hollow handle portion =13. The sections 11 and 12 are rrnly secured together by trans- Versely extending bolts 14. The front portion of the housing includes a cylindrical side wall 15 and a top wall 16. This housing lits over the base 5 and can be detachably secure-d to the base by screws 17.

Extending into the handle portion 13 are yfeed and electric return Wires 18 and supply of current can be had from any suitable alternating electric outlet or from a direct current supply in which the current is successively made and broken rapidly by means of an interrupter in the circuit. The handle also carries a trigger switch 19 for controlling the flow of current to the magnet. At this time, it is to be noted that the armature 9 extends forwardly of the magnet.

The complete electromagnet operates a plunger type pump 20 and the pump is made in sections and is carried in a novel manner, as will -be later pointed out. [In conjunction with the base 5, l utilize a novel supporting platform 21. The platform 21 is `of a disc shape and is accurately located relative to the base 5 lfor a purpose which willl also be later pointed out. It is to be noted, however, that the platform 21 :is provided with a plurality of pointed locating lugs 2.2 -which lit in sockets 23 ffonrned in the lower face of the base. The platform carries and has associated therewith certain sections of the pump. The platform is held detachably against the base by means of a union or coupling 24. This union or coupling `24- consists of an upper skirt section 25 which is threaded into the side wall 7 of the base and the upper edge of this skirt can be provided with an inturned annular flange 26 to form a suitable shoulder for supporting and holding the platform 121 against the base. A gasket 27 can be interposed between the upper end of the skirt 25 and the lower face of the platform. The union or coupling 24 also -includes a lower threaded neck section 28 and this neck section detachably receives the threaded neck 29 of a jar 30 for the p-aint. ABy the construction set forth so far, it can be seen that the jar 3d can be quickly removed from the gun for refilling with paint without 'disturbing the platform 21 in any way.

The pump 2li includes an elongated pump cylinder 31 and the 4upper end of this cylinder can be molded on or secured to the platform 21 in any desired manner. Below the cylinder 31 is provided a pump chamber 32 detachably carrying a one-way valve assembly 33. This valve assembly includes a removable valve seat 314 on which is adapted to fit a ball valve 35. The seat and valve are freely removable )for cleaning purposes. Loosely mounted in the pump chamber is a coil 32 which functions to mix up and facilitate the llow of the paint.y

Communicating -with the lower end of the pump chamber 32 is a paint feed tube 36 and this :feed tube can be formed on or secured to the platform Z1. Thus, the platform carries the major part of the pump assembly 20 and by removing the union or coup-ling 24 from the base 5 the platform and pump assembly can be quickly removed from the gun )for cleaning purposes Without disturbing any other part of the gun.

Slidably mounted on the cylinder 31 is an elongated pump plu-nger 37. This plunger extends through an opening 3K8 in the base and the construction of the platform is such that when the platform .is associated with the base the opening 38 will be in alignment fwith the cylinder 31. The upper end of the pump plunger eX- tends into the housing 10 and terminates in a rounded head 39 positioned under the forward end of the armature 9. An expansion spring 4i) is coiled around the upper end of the plunger and its opposite ends bear against the rounded head 39 and the upper fface of the base 5 and 'function to more or less hold the plunger in a raised position. Obviously, yduring the operation of the armature 9 the pump plunger will be alternately raised 3 and lowered for sucking in paint from the jar and for forcing out the paint through the feed tube 36.

The coil 32 is -independent of the pump plunger 37, but the passage of the pump plunger therethrough, incident to pump operation, tends to move or vibrate the coil in the pump chamber 32 causing a mixing of the paint passing through the pump chamber.

The base carries means for conveying paint from the feed tube 36 to the spray nozzle 41. '.[his rneans consists of a vertical sleeve 42 which can be formed on or rigidly secured to the upper face of the base 5 and with the lplatform seated against the base the sleeve will be in alignment with the feed tube 36. An annular gasket 43 can be interposed between the lower face of the base and upper face of the plat-form around the sleeve 42 and the feed tube 36. The upper end of the sleeve 42 carries an angle shaped block 44 and this block is threaded on a paint carrying tube 45 disposed within the sleeve 42. This tube section 45 can be held firmly secured in the sleeve by a tapered ynut 46 threaded on the tube section '45 against the sleeve. With the block threaded on the upper end of the tube section 4S the tube section is firmly held in place. At the same time, this tube section can be easily removed `for cleaning. The block `44 is provided with an angle passageway 47 and the block carries a coupling 48. The coupling 48 extends through the housing and is threaded into the block and 4forms means `for carrying a spring pressed ball check valve 48. This check valve normally seats and closes the passageway 47. The nozzle 41 is threaded on the coupling and the forward end of the coupling carries a paint atomizer 49. The complete assembly can be readily taken apart and cleaned, and the paint atomizer can be yformed to provide any desired type of paint pattern. It is proposed to utilize a plurality of the paint atomizcrs and to select one atomizer for use according to a selected paint pattern.

The rounded head 39 of the plunger 37, as stated, is disposed directly under the forward end of the armature 9 and the up stroke of this armature can be limited and adjusted by means of a bearing screw 50 threaded into a nut 51, rigidly carried by the top Wall 16 of the housing 10. This nut can be turned up and down by the use of a stem 52 slidably mounted in a cap 53 threaded on a sleeve 54 also rigidly carried by the housing. The sleeve 54 and its cap 53 function to slidably support the stem and the upper end of the stem can be provided with a finger knob 55. The lower end of the stem 52 is of a polygonal shape in cross-section and fits within a similarly shaped opening in the screw 50. Hence, upon the turning of the stern 52 through the knob 55 the screw can be rotated. In order to normally hold the screw and stem against rotation, the stem can carry a serrated disc 56 and the serrations thereof are adapted to match serrations 57 formed on the inner surface of the cap S3. The stem can be normally held in a raised inoperative position, in any preferred manner, such as by the use of an expansion coil spring.

Aligned openings 58 can be formed in the base 5 and platform 21 so as to establish an air vent. The improved spray gun can be used for many purposes, besides the spraying of paint, such as for moth-proofing and the spraying of insecticides for killing flies, mosquitoes etc. Also as previously brought out, pumps for heavy duty or light duty work can be easily associated with the gun.

Prom the foregoing description, it can be seen that I have provided an exceptionally simple form of electric vibrating spray gun in which all parts are readily accessible to permit the quick and effective cleaning of gun parts.

Changes in details may be made without departing from the spirit or the scope of this invention, but what l claim as new is:

1. A paint spray gun comprising a base having a depending threaded sleeve, a platform normally engaging the lower face of the base, a coupling threaded into the sleeve against the platform to detachably hold the same in position, a receptacle for holding paint detachably connected with the coupling and freely removable therefrom without disturbing the coupling, a pump assembly including a cylinder carried by the platform and a feed tube carried by the platform, a pump plunger extending through the base and platform into the cylinder, an electric vibrating motor including an armature carried by the base for operating said plunger, a feed tube carried by the base and arranged in alignment with the feed tube carried by the platform when the platform is associated with the base, and a spray nozzle in communication with the feed tube carried by the base.

2. A spray gun as defined in claim l, and said platform and base having cooperating lugs and sockets for locating the platform on the base in relation to the plunger and feed tube carried by the base.

3. A spray gun as defined in claim 1, and adjusting means for limiting the throw of the armature of the vibrating motor including an adjustable screw disposed in the path of movement of the armature, a stem and knob for turning the screw toward and away from the armature and means for preventing accidental rotation of the stem and knob after adjustment thereof.

4. A paint spray gun as dened in claim l, and said spray nozzle including a coupling, a spring pressed check valve in said coupling and an atomizing head detachably mounted on the coupling and held in place by the nozzle.

5. A paint spray gun as defined in claim 1, and said pump assembly also including a detachable valve housing carried by the lower end of the cylinder, a valve seat removably secured to the housing and a check valve in said housing movable on and off the seat.

6. An electric vibrating spray gun comprising a base having a depending threaded sleeve, a platform fitted against the lower face of the base, a coupling threaded into the sleeve against the platform to detachably hold the same in position, a receptacle for holding paint detachably connecting with the coupling and freely removable therefrom Without disturbing the coupling, a pump assembly including a cylinder carried by the platform terminating at its lower end in a pump chamber and a feed tube carried by the platform communicating with the lower end of the chamber, a pump plunger extending through the base and platform and reciprocally mounted in the cylinder, an electric vibrating motor car ried by the base for actuating said plunger, a feed tube carried by the base and arranged in alignment with the feed tube carried by the platform when the platform is associated with the base, a spray nozzle in communication with the feed tube carried by the base, and said pump assembly also including a removable valve housing carried by the lower end of the pump chamber, a valve lseat detachably mounted in the valve housing, a ball check valve carried by the valve housing for said seat, and a loose coil tted in the pump chamber for agitating the paint during the reciprocation of the plunger.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A PAINT SPRAY GUN COMPRISING A BASE HAVING A DEPENDING THREADED SLEEVE, A PLATFORM NORMALLY ENGAGING THE LOWER FACE OF THE BASE, A COUPLING THREADED INTO THE SLEEVE AGAINST THE PLATFORM TO DETACHABLY HOLD THE SAME IN POSITION, A RECEPTACLE FOR HOLDING PAINT DETACHABLY CONNECTED WITH THE COUPLING AND FREELY REMOVABLE THEREFROM WITHOUT DISTURBING THE COUPLING, A PUMP ASSEMBLY INCLUDING A CYLINDER CARRIED BY THE PLATFORM AND A FEED TUBE CARRIED BY THE PLATFORM, A GROUP PLUNGER EXTENDING THROUGH THE BASE AND PLATFORM INTO THE CYLINDER, AN ELECTRIC VIBRATING MOTOR INCLUDING AN ARMATURE CARRIED BY THE BASE FOR OPERATING SAID PLUNGER, A FEED TUBE CARRIED BY THE BASE AND ARRANGED IN ALIGNMENT WITH THE FEED TUBE CARRIED BY THE PLATFORM WHEN THE PLATFORM IS ASSOCIATED WITH THE BASE, AND A SPRAY NOZZLE IN COMMUNICATION WITH THE FEED TUBE CARRIED BY THE BASE. 